micronAU is an audio unit that lets you fully control and automate the Alesis Micron synthesizer.
This audio unit provides an interface through which the entire sound generation engine of the Mircon can be controlled in real time. In addition, all parameter settings are saved when the track/DAW hosting micronAU is saved.
When one reloads a track [...]

Alpha Juno Control is a free, open source Mac OS X patch editor for the Alpha Juno.
It will let owners of Roland’s Alpha Juno keyboard control patch parameters via MIDI from their Mac.
via Moogulator

Korg USA and Karma Lab have posted a Flash-based OASYS Virtual GUI, an online demo that allows users to explore a virtual replica of the graphic user interface of the Korg OASYS Open Architecture Synthesis Studio.
This full-blown simulator provides an interactive, in-depth tour of the OASYS interface in a way that gives a true feel [...]